/*
 * Strawberry Music Player
 * This file was part of Clementine.
 * Copyright 2010, David Sansome <me@davidsansome.com>
 *
 * Strawberry is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Strawberry is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Strawberry.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "config.h"

#include <QObject>
#include <QMutex>
#include <QList>
#include <QString>

#include "taskmanager.h"

TaskManager::TaskManager(QObject *parent) : QObject(parent), next_task_id_(1) {}

int TaskManager::StartTask(const QString &name) {

  Task t;
  t.name = name;
  t.progress = 0;
  t.progress_max = 0;
  t.blocks_collection_scans = false;

  {
    QMutexLocker l(&mutex_);
    t.id = next_task_id_++;
    tasks_[t.id] = t;
  }

  emit TasksChanged();
  return t.id;

}

QList<TaskManager::Task> TaskManager::GetTasks() {

  QList<TaskManager::Task> ret;

  {
    QMutexLocker l(&mutex_);
    ret = tasks_.values();
  }

  return ret;

}

void TaskManager::SetTaskBlocksCollectionScans(int id) {

  {
    QMutexLocker l(&mutex_);
    if (!tasks_.contains(id)) return;

    Task &t = tasks_[id];
    t.blocks_collection_scans = true;
  }

  emit TasksChanged();
  emit PauseCollectionWatchers();

}

void TaskManager::SetTaskProgress(int id, int progress, int max) {

  {
    QMutexLocker l(&mutex_);
    if (!tasks_.contains(id)) return;

    Task &t = tasks_[id];
    t.progress = progress;
    if (max) t.progress_max = max;
  }

  emit TasksChanged();
}

void TaskManager::IncreaseTaskProgress(int id, int progress, int max) {

  {
    QMutexLocker l(&mutex_);
    if (!tasks_.contains(id)) return;

    Task &t = tasks_[id];
    t.progress += progress;
    if (max) t.progress_max = max;
  }

  emit TasksChanged();

}

void TaskManager::SetTaskFinished(int id) {

  bool resume_collection_watchers = false;

  {
    QMutexLocker l(&mutex_);
    if (!tasks_.contains(id)) return;

    if (tasks_[id].blocks_collection_scans) {
      resume_collection_watchers = true;
      for (const Task &task : tasks_.values()) {
        if (task.id != id && task.blocks_collection_scans) {
          resume_collection_watchers = false;
          break;
        }
      }
    }

    tasks_.remove(id);
  }

  emit TasksChanged();
  if (resume_collection_watchers) emit ResumeCollectionWatchers();

}

int TaskManager::GetTaskProgress(int id) {

  {
    QMutexLocker l(&mutex_);
    if (!tasks_.contains(id)) return 0;
    return tasks_[id].progress;
  }

}

